{"schemaVersion":1,"id":"CVE-2026-109439","requestedId":"CVE-2026-109439","aliases":[],"status":"published","rawState":"Received","rawSeverityStatus":"Received","duplicateOf":null,"indexable":true,"title":null,"description":"Lantronix XPress-DR and XPress-DR-I (CoBos-family) firmware through 8.1.0.0 contains a missing authentication vulnerability that allows remote attackers to read and persistently overwrite device configuration by sending crafted frames to the unauthenticated UDP configuration protocol on port 30718. Attackers can send a type 0xF8 query to read live configuration data and a type 0xFD frame with exactly 0x78 body bytes to rewrite the device IP address and serial-channel forwarding records, causing changes to commit to EEPROM and persist across reboots. The XPress-DR product series reached end-of-life/end-of-support in February 2025.","dates":{"published":"2026-10-14T16:45:49.338Z","modified":"2026-10-14T16:45:49.338Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":9.8,"severity":"critical","version":"3.1","versionLabel":"v3.1","source":"cve.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"cve.org","score":9.3,"severity":"critical","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"cve.org","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"nvd","score":9.3,"severity":"critical","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"nvd","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":null,"percentile":null,"severity":"unknown","asOf":null,"change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[],"last30":[]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","evidence":[]},"exploits":[],"exploitCount":0,"exploitSources":[],"weaknesses":[{"id":"CWE-306","name":"Missing Authentication for Critical Function","description":"The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/306.html","capec":[{"id":"CAPEC-12","name":"Choosing Message Identifier","url":"https://capec.mitre.org/data/definitions/12.html"},{"id":"CAPEC-166","name":"Force the System to Reset Values","url":"https://capec.mitre.org/data/definitions/166.html"},{"id":"CAPEC-216","name":"Communication Channel Manipulation","url":"https://capec.mitre.org/data/definitions/216.html"},{"id":"CAPEC-36","name":"Using Unpublished Interfaces or Functionality","url":"https://capec.mitre.org/data/definitions/36.html"},{"id":"CAPEC-62","name":"Cross Site Request Forgery","url":"https://capec.mitre.org/data/definitions/62.html"}],"techniques":[],"countermeasures":[]}],"ttp":{"capecs":[{"id":"CAPEC-12","name":"Choosing Message Identifier","url":"https://capec.mitre.org/data/definitions/12.html","weaknessIds":["CWE-306"],"techniqueIds":[]},{"id":"CAPEC-166","name":"Force the System to Reset Values","url":"https://capec.mitre.org/data/definitions/166.html","weaknessIds":["CWE-306"],"techniqueIds":[]},{"id":"CAPEC-216","name":"Communication Channel Manipulation","url":"https://capec.mitre.org/data/definitions/216.html","weaknessIds":["CWE-306"],"techniqueIds":[]},{"id":"CAPEC-36","name":"Using Unpublished Interfaces or Functionality","url":"https://capec.mitre.org/data/definitions/36.html","weaknessIds":["CWE-306"],"techniqueIds":[]},{"id":"CAPEC-62","name":"Cross Site Request Forgery","url":"https://capec.mitre.org/data/definitions/62.html","weaknessIds":["CWE-306"],"techniqueIds":[]}],"techniques":[],"countermeasures":[],"countermeasuresByTactic":[]},"affected":[{"vendor":"lantronix","product":"xpress-dr","name":"XPress-DR","label":"xpress-dr","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"source":null,"versions":[{"text":"≤ 8.1.0.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≤ 8.1.0.0","eol":null},{"vendor":"lantronix","product":"xpress-dr-i","name":"XPress-DR-I","label":"xpress-dr-i","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"source":null,"versions":[{"text":"≤ 8.1.0.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≤ 8.1.0.0","eol":null}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://cdn.lantronix.com/wp-content/uploads/pdf/PCN-753-Rev-B-EOL-Notice-XPRESS.pdf?xnotes__c=I%20am%20interested%20in%20the%20XPress%20DR%20/%20XPress%20DR-IAP.","label":"cdn.lantronix.com/wp-content/…","hostname":"cdn.lantronix.com","tags":["Vendor Advisory"],"sources":["cve.org","nvd"]},{"url":"https://www.vulncheck.com/advisories/lantronix-xpress-dr-unauthenticated-configuration-write-via-udp-30718","label":"www.vulncheck.com/advisories/lantronix-xpress-dr-unauthenticated-configuration-write-via-udp-30718","hostname":"www.vulncheck.com","tags":["Third Party Advisory"],"sources":["cve.org","nvd"]}],"droppedReferenceCount":0,"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-10-14T16:45:49.338Z","label":"Published","detail":"Vulnerability first disclosed.","source":null}],"risk":{"score":70,"level":"high","profile":"default","profileName":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10},"appliedRules":["high-cvss-alone"]},"warnings":[],"meta":{"dataAsOf":"2026-10-14T19:51:48.949Z","stale":false,"partial":false}}